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AMEGO-X, the All-sky Medium Energy Gamma-Ray Observatory eXplorer, is aproposed instrument designed to bridge the so-called "MeV gap" by surveying thesky with unprecedented sensitivity from ~100 keV to about one GeV. This energyband is of key importance for multi-messenger and multi-wavelength studies butit is nevertheless currently under-explored. AMEGO-X addresses this situationby proposing a design capable of detecting and imaging gamma rays via bothCompton interactions and pair production processes. However, some of theobjects that AMEGO-X will study, such as gamma-ray bursts and magnetars, extendto energies below ~100 keV where the dominant interaction becomes photoelectricabsorption. These events deposit their energy in a single pixel of thedetector. In this work we show how the ~3500 cm^2 effective area of the AMEGO-Xtracker to events between ~25 keV to ~100 keV will be utilized to significantlyimprove its sensitivity and expand the energy range for transient phenomena.Although imaging is not possible for single-site events, we show how we willlocalize a transient source in the sky using their aggregate signal to within afew degrees. This technique will more than double the number of cosmologicalgamma-ray bursts seen by AMEGO-X, allow us to detect and resolve the pulsatingtails of extragalactic magnetar giant flares, and increase the number ofdetected less-energetic magnetar bursts -- some possibly associated with fastradio bursts. Overall, single-site events will increase the sensitive energyrange, expand the science program, and promptly alert the community of faintertransient events.

Improving the low-energy transient sensitivity of AMEGO-X using single-site events